CDKN1B and acute lymphoblastic leukemia: A similar situation appears in T-ALL cells, IL-7 not only upregulates the expression of Bcl-2 and down-regulates the cyclin-dependent kinase inhibitor p27kip1 in T-ALL cells to avoid apoptosis, but also leads to continuing reaction of cyclin D2 and cyclin A during cell cycle progression [87,88].